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Noun
S:
(n)
yolk sac
,
vitelline sac
,
umbilical vesicle
,
vesicula umbilicus
(membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional)
S:
(n)
yolk sac
(membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo)